Abstract: A storage medium control apparatus capable of improving the processing performance, while protecting copyright protection information in a security mode, includes: a secure resource which executes mutual authentication processing with an authentication area of a storage medium, and performs encryption or decryption of data; a normal resource which sends or receives data to or from the storage medium; an encryption control unit which performs encryption or decryption of data by controlling the secure resource in the secure mode; a storage medium control unit which sends or receives data encrypted by the encryption control unit or data decrypted by the encryption control unit to or from the storage medium by controlling the normal resource, in the secure mode; and a storage medium processing unit which performs predetermined processing for the data decrypted by the encryption control unit or unencrypted data read from the storage medium by the storage medium control unit.

Abstract: To provide an encryption instruction processing apparatus which makes it possible to reliably prevent fraud analysis of a program, encrypt only part of the program requiring protection so as to reduce a decryption time in a simple manner, and suppress increase in a hardware size, an encryption instruction processing apparatus is formed so that the apparatus includes an instruction decryption section and a decryption key storage section and decryption keys are stored in the encryption key storage section. Each of encryption extended instruction codes to be processed by the encryption instruction processing apparatus includes an instruction code and an instruction encryption identifier indicating whether or not the instruction code is encrypted. The instruction codes are encrypted according to the degree of confidentiality of each instruction code.